124 lines
4.2 KiB
C#
124 lines
4.2 KiB
C#
//Copyright (C) 2005 Richard J. Northedge
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//This file is based on the BinaryGISModelReader.java source file found in the
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//original java implementation of MaxEnt. That source file contains the following header:
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// Copyright (C) 2001 Jason Baldridge and Gann Bierner
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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using System;
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using System.IO;
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namespace BotSharp.MachineLearning.IO
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{
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/// <summary>
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/// A reader for GIS models stored in the binary format produced by the java version
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/// of MaxEnt. This binary format stores data using big-endian values, which means
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/// that the C# version must reverse the byte order of each value in turn, making it
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/// less efficient. Use only for compatibility with the java MaxEnt library.
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/// </summary>
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/// <author>
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/// Jason Baldridge
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/// </author>
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/// <author>
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/// Richard J. Northedge
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/// </author>
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/// <version>
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/// based on BinaryGISModelReader.java, $Revision: 1.1.1.1 $, $Date: 2001/10/23 14:06:53 $
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/// </version>
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public class JavaBinaryGisModelReader : GisModelReader
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{
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private readonly Stream _input;
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private readonly byte[] _buffer;
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private int _stringLength = 0;
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private readonly System.Text.Encoding _encoding = System.Text.Encoding.UTF8;
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/// <summary>
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/// Constructor which directly instantiates the Stream containing
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/// the model contents.
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/// </summary>
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/// <param name="dataInputStream">The Stream containing the model information.
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/// </param>
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public JavaBinaryGisModelReader(Stream dataInputStream)
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{
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using (_input = dataInputStream)
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{
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_buffer = new byte[256];
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base.ReadModel();
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}
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}
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/// <summary>
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/// Constructor which takes a filename and creates a reader for it.
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/// </summary>
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/// <param name="fileName">The full path and name of the file in which the model is stored.
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/// </param>
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public JavaBinaryGisModelReader(string fileName)
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{
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using (_input = new FileStream(fileName, FileMode.Open, FileAccess.Read))
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{
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_buffer = new byte[256];
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base.ReadModel();
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}
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}
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/// <summary>
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/// Reads a 32-bit signed integer from the model file.
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/// </summary>
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protected override int ReadInt32()
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{
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_input.Read(_buffer, 0, 4);
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Array.Reverse(_buffer, 0, 4);
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return BitConverter.ToInt32(_buffer, 0);
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}
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/// <summary>
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/// Reads a double-precision floating point number from the model file.
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/// </summary>
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protected override double ReadDouble()
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{
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_input.Read(_buffer, 0, 8);
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Array.Reverse(_buffer, 0, 8);
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return BitConverter.ToDouble(_buffer, 0);
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}
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/// <summary>
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/// Reads a UTF-8 encoded string from the model file.
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/// </summary>
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protected override string ReadString()
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{
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//read string from binary file with UTF8 encoding
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_stringLength = (_input.ReadByte() * 256) + _input.ReadByte();
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_input.Read(_buffer, 0, _stringLength);
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return _encoding.GetString(_buffer, 0, _stringLength);
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}
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}
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}
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